Manufacture of a white pigment



A. L. BARBE.

MANUFACTURE OF A WHITE PIGMENT.

APPLICATION FILED AUG.5, 1921.

Patented Nov. 15, 1921.

UNITED "STATES,

AUGUSTI l LOUIS BARBIE, OF ASNIERES, FRANCE.

MANUFACTURE or a wirrrn manual. I

Specification of Letters Patent.

Patented Nov. 15, 1921.

Application flled'August 5, 1921. Serial No. 490,107.

(GRANTED-UNDER THE PROVISIONS OF THE ACT OF MARCH 3, 1921, 41 STAT. L, 1318.)

.tralize it, but the resultant product so formed contains a certain amount-of alkaline sulfates.

The present invention consists in blow ing a current of oxygen or compressed air through the antimony oxid after the alkaline solution has been added to eliminate the sulfates formed.

In carrying out the invention the oxid of antimony obtained by the roasting of antimonysulfid is separated and a quantity of the oxid of antimony to be treated is introduced into a vat or the like containing water. There is then added slowly an alkaline solution, preferably lime, and the mixture is then well agitated.

A current of oxygen, or more simply, a current of compressed air, is then admitted into the mixture.

The mixture is then taken from the vat or the like and dried, and the result is a roduct of a remarkable fineness and perect-ly white, and equal to any of the white pigments used in aint.

The annexed drawing represents, by way of example, an apparatus which can be utilized for carrying out the invention.

Thls apparatus is composed of a vat 1, closed by a cover 2, and in which is mounted an agitator composed of a shaft 3 carrying armsor agitating members 4 ofsuitable size and shape; at the lower part ofthe vat is placed apipe'5 which serves for the insertion of the compressed air, and which is provided with a tap or cook 6. The oxid of antimony in suspension in the water is introduced into the vat; the alkaline solution is then added, and the agitation is then commenced in order to obtain an intimate mixture of the ingredients contained in the vat, and to terminate the operation compressed air is then admitted by opening the tap or cock 6. The resultant oxid is then dried and in order to prepare a paint, oil is incorporated either by itself or with other suitable products and can be used in place of white lead or zinc white.

I claim: l 1. In the production of a white pi ent from antimony oxid by treating with a kaline solution, the elimination. of any sulfates by blowing a current of air or oxygen through the mixture after the alkalinesolution has been added.

2. A commercial product resultin the process as -in claim pigment for paint.

from

Aueu'srn' ouis BARBE.

1, utilizab e as a n wltness whereof I 'afiix my signature. V 

